6.1 didn't have much: LTE support for more carriers Purchase movie tickets through Fandango with Siri (USA only) iTunes Match subscribers can now download individual songs from iCloud New button to reset the Advertising Identifier

The 5C will be much easier and cheaper to assemble than the 4S and 5. Plus Apple will be taking a higher share. Their current problem is that many still buys 4 and 4S, and they have a relatively low margin.

The iPhone 5 works in China. The page you are linking to only concerns LTE. And the event in China will just be a replay of the US one: http://allthingsd.com/20130904/apple-will-hold-satellite-iphone-events-in-beijing-berlin-and-tokyo/